Mold for manufacturing of rubber soles



R. F. KNIGHT. MOLD FOR MANUFACTURINGOF RUBBER SOLESP APPLICATION FILED MAR, 1. i920.

1,438,245, 1 Patented Dec. 12,1922.

I II (I' I 57 J? .23 J 2 35 .35

Patented Dec. 12, 1922.

han

ACHINERY :CQBIEQBATIQN, KEV/JERSEY.

or rarnnsom NEW tr'rinsnv, a conronnrron or MOLD roe manurecrunnzre or nu'eennsotns. 1 5

Application filed. March 1, 1920. Serial No. ia 62,275:

To all whom it may concern:

Be it known that I, -RALPH F. KNIGHT, a citizen of the United States, residing'at iBeverly,'in the county of Essex and State 5 of Massachusetts, have inventedcertain Iniprovements in Molds for Manufacturing of Rubber -Soles,1of which the following-de- -scription,'-in connection with the accom- Tpanying -drawings,';is a vspecification, like reference characters {on the drawings indicating like partsin the several figures. 7

This invention relatesto the manufacture of soles of rubber or rubber compound, which for convenience will hereinafter be referred to .as rubber soles, and is herein illustrated as embodied in a mold for making-aturn sole. i

"In the'manufacture vof rubber-soled turn shoes it is common in some *factories toena- ;ploy aasole'having integralwith ita rubber :heel. A- rubber solewhether or not it .proz-videdwithan integral rubber heel, has von its upper; side-a sewing shoulder or :seflwingrib which, in case jshoes 'having sewed-seats '25zareto1be Inade,' extends entirely aroundzthe .,sole-at' a distance sfrom the margimthe horizontal margin of the upper face of the sole outsidelthe rib constituting the feather. ."In. the 'manufacture ,of .the shoe .the sole together with an assembled upper is placed wwrong side-out upo'na last, andthe upper attached: to the solebyJstitches-whichshould p'ass throughithe base ofthe rib from out- :isiderto inside. In the case of a sole which hasno heel thexlast i's'curved slightly clowni in the 1 heel portion :Of: the sole is not bent idownwardlyiwith the result that the needle t a f, the-sewing machine tends to pilssthroughv wthet -rib '-,or shoulder-onwthe-1hee1 portion of the sole ,atqpoints located abovethabaae o said rib or shoulder thereby producing,

when the, shoeis turned right side out, a

"loose heeleseataswell as one which is not as strongasitshould be. To avoid this'difii cultyit hasgbeen proposed to providea sole having an'integrel heel with a downwardly 6O and v1 outwardly inclined feather around its -.heel portion such a sole being disclosed and claimed in co-pending application Serial 3%, 362 055 filed in the i namejof 'George Ferguson and'ownedby thejsame assignee asis the-present applicationj'; The general objector nth .theflsoleof the application andJthQse prefacture may readily-be made. Referringn0;.v t-o the ac c Inpa-nyi ,drawings,' v -Eigure 1 is a perspective of parts of the h nk d'h e p r on 05 3 e me di which :i't pres tiieve ienii m t F g. 2 is a c as -semen through? Y hor en f a e me d;

Fig.;;33is a cross-sectio i part' of theinold; y 1 l Fig! 4 is a cross-sectionithrough the" heel ;-portio1n of a lasted shoe, having 1a; solemade i by-the Arnold,; thesolebeing shown in process of e ngamche ee upp o h-e a Iithrough the forei upper being wrong side out, and

Fig. 5, is agcross s'ecti'on similarto Fig. 4: but taken throughpthe. forepart of the same shoe..- I P111358 ring firstto 5, itMwilLbe seen that'inthe,forepart-ot-the lasted shoeithe v margin;. of the isole ,7\is. bent downwardly wbr e onihe ns e P lle down po .athe eurved margin o ifvthe bottoin of the forepart ofthe lasti g, The feather 'llof ithesole is thusinclined downwardlyfrom hthewbase otzthe;sewing shoulder 1;} or sew- -ing;-11ib 15 to facilitate passageof the needle :17: -,thrqugh, said -base.. lnthe heellpore stion either last theubottornylil is flatfbut even if the *bottomabfitheheel portion of the lastha-d 5a margin curved like; that of -thegQ-forepart,.it would be impractical if not, impossible to bend "the margin. of the thickgheelrzl .of the soleso as :to incline B-thG' ffGRth QIf. It hasthereforegbeen proppsed.

to {form the f feather around the heel -pl or- Le wit e.p rm nent.ine ine e ow -1- *T smerr r t fac lita e lit e s wi e present inven z .t on is toprovide;a suitable mold by which .i v

, and the wall 27 is a wall or surface 31, which determines the shape of the; feather not the sole. The surface 31 is corrugated in the forepart the mold as shown in Fig.

1 for a purpose which need not" here be described since it forms no p'art of the Surrounded by the v present invention. groove is a cavity the bottoi1 33 of which is on a level with thebottom of the groove 25, the purpose of this cavity being'to' provide in the sole a raised portionto serve as a filler. The lower section 29 has in it a cavity rectangular in cross-section bounded by the sole-edge-forming wall'27 and the tread-surface-forming wall orb'ottom 35. As thus far described, the mold is in general like those'shown 'in' applications Serial No. 188,174 and""Serial"No. 818,728, Patent 1,354,784 filed inthe name I of Ferguson and owned by'jthef same as- .signee as 'islthe present 'applicati on';jand,

if the rear part of thesection -23 were like the forepart, there would be produced around the margin of theupp'er face of the sole a horizontal feather extending substan- .tially perpendicularly to the adjacent upright wall or' shoulder of the sewing rib.

It is desired, however, to produce around the heel end of the sole a feather inclined as. shown in Fig. 4Q 'In order to'accomplish this and at the same'timeto maintain the contacting surfaces of the sections" in the common plane 37 and the plane without obstructions, the cavity in the upper section 23 is deepened as it approaches the heel end of the section, the feather-forming surface 31 being beveled as shown in Figs. 1 and 2. It shouldbe understood that the cavity in the section-J29,gr'ows' correspondiingly less deep than it would ordinarily have been as it approaches the heel/end of f the section. In Fig. 2, the dot-and-dash line indicates approximately what would have been the depth of the cavity in the heel end of the section 29 if the depth ofthe cavity in the member 23 had been kept con- .stant as in the usual mold for producing a horizontal feather all around the sole.

In other words, the solewdoes notlie flat in the, mold'as has been the case hitherto but is bent or curved slightly. -Withjthe sections of the mold in the positions shown in the figures, the heel portion'ofthe sole would e b nt pw r ly in he vi n ty of 1 assess the heel breast line as best shown in Fig. 1. The bend or curvature of the sole produced by the mold is comparatively small; and with a yieldable material such as rubber is of no disadvantage .whatever. Indeed, it is doubtful whether, when the molding and vulcanizing operation is carried out in the usual manner, the curvature is permanent. A sole taken from the mold, as it usually is, while still very hot and laid on a flat" plate has usually lost all of its curvature so far a casual inspection will determine, by the timeit has cooled.

But in any event the curvature, cvenif it -1s permanent,"w1ll be removed when the sole is drawn down upon the last during the p illing over and lasting operations.

Although the invention has been'set forth as embodied in a particular-molddesigne'd to produce a particular. sole, it should be understood that the invention 'is'not limited in the scope of its application-to the particular mold which has been shown and described.

Having thus described my invention,

' 1. A mold for use in the manufacture of a rubber sole whichhas a sewing rib andan ad acent feather, said mold consisting entirelyflof two one-piece'sections having I c ontacting faceslocated in a "common plane, one

section beingshaped to form the'tread face and edge of the sole'and the other 'section having a groove to form 'therib and asurface to form'the' feather, the feather-forming surface in'the fore'pa'frt of the moldlying in the plane of the contacting'surfaces of the v sections a-nd in' the heel portion of the mold being inclined to said plane. 2. YA mold foryuse in the manufacture of a'rubber 'sole which has'a sewing rib and v an adjacent feather,'said mold consisting'entirely of two one-piece sections having contacting faces located in a common plane, one section belng shaped to form the tread face and edge' of the'sole and the other section having a groove to form the rib and a surface to'formthe feather, the feather-forming'surface'in the forepart of the mold lying in the plane of the contacting surfaces of the sections and in the'heel portion of'the mold being'inclined from the rib-forming groove.

3. A mold for use in the manufacture" of arubber sole which has a sewing rib and an adjacent feather, said mold comprising a rib-forming section and a tread-forming section having contacting faces located in a said plane toward ffcommon plane, the bottom of the groove in the forepart of the rib-formingsection be- 111g locateda'lessdistance from said common plane than is the bottom Oran groove in the rear part of the same section; r 1

i. A. mold for use in manufacturing a rubber sole which has asewing rib and an adjacent feather, said mold comprising two sections one of which has a groove adapted to form the rib and the other of which has a cavity adapted to form the tread face and edge of the sole, the level of the bottom of the groove in the groove-forming section being different at different parts of the lastnamed section.

5. A mold for use in manufacturing a rubber solev which has a sewing rib and an adjacent feather, said mold comprising two sections one of which has a groove adapted to form the rib and the other of which has a cavity adapted to form the tread face and edge of the sole, the level of the bottom of the groove in the forepart of. the grooveforming section being different from the level of the bottom of the groove in the rear part of the same section.

6. A mold for use in the manufacture of a rubber sole which has on its upper part a sewing rib, said mold comprising a section having a groove to form the rib and a surface to form that portion of the upper face of the sole which lies between the runs of the rib, and a section having a cavity adapted to form the tread face andedge of the sole,

said sections having contacting faces located 7. A mold for use in the manufacture of a rubber sole which has a sewing rib and an adjacent feather, the feather being atvright angles to the rib around the forepart of the sole and inclined downwardly around the rear part of the sole comprising a rib-forming section and a tread-forming section shaped to hold the sole blank, during the molding andvulcanizing operations, bent in the locality of the heel breast line of the sole blank, the sections having contacting faces located in a common plane and the bottom of the groove in the forepart of therib- 1 forming section being located at a less distance from said common plane than is the bottom of the groove in the rear part of the same section. a

In testimony whereof I have signed my name to this specification.

RALPH F. KNIGHT. 

